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I haven't watched the whole thing, did they address the problem of writing? All I saw was detecting firing neurons from a small region of the brain (which is cool and useful in itself) but saw nothing about actually transmitting to the brain signals that the brain can interpret correctly. Which seems by far the hardest part, when the device stops being a pure observer of a tiny region of the brain.

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I believe that they did show the "threads" firing, and the neurons lighting up in response.

I imagine that initially they will be focusing on blunter interventions into the brain, like detecting impending epileptic attacks, and send some sort of signal to try and interrupt it. I think such things already exist in a cruder form.

It's going to be a long while, and a lot of iterations before you can expect to just "know" the contents of your latest text message.

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